Sony announced it has permanently dropped the price of the Sony Tablet S by $100 starting today. That means the 16GB Tablet S is now $399 and the 32GB is now $499. On top of these savings, Sony is also currently offering (for a limited time) a store credit and five free Video Unlimited movie rentals, five free PlayStation Store game downloads and 180 days of free Music Unlimited service with the purchase of a Tablet.